From ea29400617575209911d08590e9e461a1015bcb3 Mon Sep 17 00:00:00 2001 From: Hendrik Langer Date: Wed, 18 Jul 2018 00:22:28 +0200 Subject: [PATCH] add cad --- README.md | 20 ++++- cad/case.scad | 204 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 222 insertions(+), 2 deletions(-) create mode 100644 cad/case.scad diff --git a/README.md b/README.md index b9b5a60..57341b2 100644 --- a/README.md +++ b/README.md @@ -1,4 +1,6 @@ +# Usage + ## Instructions * Plug HDMI into Beamer * Plug USB into Computer @@ -7,6 +9,8 @@ * press WindowsKey+Y to take a screenshot * simply unplug after use +# Initial setup + ## Parts * Mini-HDMI <-> HDMI Adapter * Mini-USB <-> USB A Cable @@ -41,15 +45,27 @@ sudo raspi-config sudo su - apt update apt dist-upgrade -apt install python3-pyinotify python3-rpi.gpio +apt install python3-pyinotify python3-rpi.gpio +apt clean echo "dtoverlay=dwc2" >> /boot/config.txt copy everything to /opt/freezer/ add to /etc/rc.local: python3 /opt/freezer/display.py +### read-only root + wget https://raw.githubusercontent.com/adafruit/Raspberry-Pi-Installer-Scripts/master/read-only-fs.sh + sudo bash read-only-fs.sh + * continue: y + * jumper: n + * gpio-halt: n + * watchdog: n + * continue: y + -readonly-root +### this is how to remount read-write later to make changes to the fs +mount -o remount,rw / +mount -o remount,rw /boot ## ToDo diff --git a/cad/case.scad b/cad/case.scad new file mode 100644 index 0000000..b4feab3 --- /dev/null +++ b/cad/case.scad @@ -0,0 +1,204 @@ +//Pi Zero parametric box design with camera support +//R.J.Tidey 17th May 2016 + +// General parameters +//build 1=base, 2=lid, 3=both +build = 3; +//camera 0=none, 1=internal, 2=external +camera = 0; +//GPIO 0=no cut_out, 1=top cut_out, 2 side cut out +gpio = 2; +wall = 2.0; +hdmi_recess = 1; +corner = 3.0; +tol = 0.3; +$fn=20; + + +//Base parameters +//inner dimensions +base_width = 30; +//65 for original pizero with no camera connector +//67 for pizero with camera connector +//70 to give more radius for bending cable back internally +base_length = camera==1 ? 70.0 : 67.0; +hole2hole_l = 58; +hole2hole_w = 23; + +hdmi_recess_w = 17.5; +hdmi_recess_h = 3.75; + +support_offset = 3.5; +support_height = 1.0; +support_radius = 1.4; +support_size = 7.0; +usbpower_offset = 54.0; +usbusb_offset = 41.4; +usb_length = 9.25; +hdmi_offset = 12.4; +hdmi_length = 13.75; +cutout_height_offset = 1.0; +sd_offset = 16.7; +sd_width = 13.0; + +//Lid parameters +//1.5 for no camera shallow +//6 for camera +lid_height = camera==1 ? 6.0 : 1.5; +board_thick = 1.35; +connector_thick = 3.2; +screw_depth = 8.0; +screw_radius = 1.3; +gpio_centre_x = 32.5; +gpio_centre_y = 3.5; +gpio_length = 51.5; +gpio_width = 6; +gpio_recess_h = 1.2; +corner_size = 2.4; + +//Camera parameters, +camera_hole = 10; +camera_x = 20.0; +camera_screw_centre_offset = 0.0; +camera_screw_x = 12.5; +camera_screw_y = 21.0; +camera_screw_r = 1.5; +camera_cable_y = 20.0; +camera_cable_h = 1.0; + +//calculate required base_height +base_height = support_height + board_thick + connector_thick + tol; +echo("base_height = ",base_height); +echo("base_length = ",base_length); +echo("lid_height = ",lid_height); + +module round_cube(start,length,width,height,z_offset,cor) { + hull() { + translate([start,start,z_offset]) + cylinder(height+wall,r=cor); + translate([start+length,start,z_offset]) + cylinder(height+wall,r=cor); + translate([start+length,start+width,z_offset]) + cylinder(height+wall,r=cor); + translate([start,start+width,z_offset]) + cylinder(height+wall,r=cor); + } +} + +module screwhole() { + cylinder(wall+support_height+tol,r=support_radius); + cylinder(wall*0.75,2*support_radius,support_radius); +} + +module corner_support() { + difference() { + union() { + round_cube(corner-2*tol,corner_size,corner_size,lid_height,0,corner); + translate([support_offset,support_offset,wall-0.1]) + cylinder(lid_height+connector_thick+0.1,4,3); + } + translate([support_offset,support_offset,wall+lid_height+connector_thick-screw_depth]) + cylinder(screw_depth+1,r=screw_radius); + } +} + +module cut_outs(height) { + translate([tol+hdmi_offset-0.5*hdmi_length,-wall-0.1,height]) + cube([hdmi_length, wall+ 1.0,base_height]); + translate([tol+usbusb_offset-0.5*usb_length,-wall-0.1,height]) + cube([usb_length, wall+ 1.0,base_height]); + translate([tol+usbpower_offset-0.5*usb_length,-wall-0.1,height]) + cube([usb_length, wall+ 1.0,base_height]); + translate([-wall-0.1,tol+sd_offset-0.5*sd_width,height]) + cube([wall+ 1.0,sd_width,base_height]); + if(hdmi_recess==1) { + translate([tol+hdmi_offset-0.5*hdmi_recess_w,-wall-0.1,wall]) + cube([hdmi_recess_w, wall+ 0.1,base_height]); + } + if(camera==2) { + translate([base_length - 2* wall,tol+0.5*(base_width-camera_cable_y),height]) + cube([4*wall,camera_cable_y,camera_cable_h]); + } + if(gpio==2) { + translate([tol + gpio_centre_x - gpio_length*0.5,tol+base_width-wall,height]) + cube([gpio_length,4*wall,base_height]); + } +} + +module base_shell() { + difference() { + round_cube(corner-wall,base_length+2*tol+2*wall-2*corner,base_width+2*tol+2*wall-2*corner,base_height,0,corner); + round_cube(corner-tol,base_length+4*tol-2*corner,base_width+4*tol-2*corner,base_height,wall,corner); + } + translate([-tol,-tol,0]) + cube([support_size,support_size,support_height+wall]); + translate([hole2hole_l+tol,-tol,0]) + cube([support_size,support_size,support_height+wall]); + translate([hole2hole_l+tol,hole2hole_w+tol,0]) + cube([support_size,support_size+2*tol,support_height+wall]); + translate([-tol,hole2hole_w+tol,0]) + cube([support_size,support_size+2*tol,support_height+wall]); + } + +module base() { + difference() { + base_shell(); + translate([tol+support_offset,tol+support_offset,-0.1]) screwhole(); + translate([tol+support_offset+hole2hole_l,tol+support_offset,-0.1]) screwhole(); + translate([tol+support_offset+hole2hole_l,tol+support_offset+hole2hole_w,-0.1]) screwhole(); + translate([tol+support_offset,tol+support_offset+hole2hole_w,-0.1]) screwhole(); + cut_outs(wall+support_height+board_thick-tol); + } +} + + +module lid_shell() { + difference() { + round_cube(corner-wall,base_length+2*tol+2*wall-2*corner,base_width+2*tol+2*wall-2*corner,lid_height,0,corner); + round_cube(corner-tol,base_length+4*tol-2*corner,base_width+4*tol-2*corner,lid_height,wall,corner); + if(gpio==1) { + translate([tol+gpio_centre_x-0.5*gpio_length,tol+gpio_centre_y-0.5*gpio_width,-0.5]) + cube([gpio_length,gpio_width,wall+1.0]); + } + if(camera==1) { + translate([tol+camera_x,tol+0.5*(base_width-camera_hole),-0.5]) + cube([camera_hole,camera_hole,wall+1.0]); + translate([tol+camera_x+0.5*camera_hole+camera_screw_centre_offset,tol+0.5*base_width,-0.5]){ + translate([0,-0.5*camera_screw_y,0]) cylinder(wall+1.0,camera_screw_r,camera_screw_r); + translate([0,0.5*camera_screw_y,0]) cylinder(wall+1.0,camera_screw_r,camera_screw_r); + translate([-camera_screw_x,-0.5*camera_screw_y,0]) cylinder(wall+1.0,camera_screw_r,camera_screw_r); + translate([-camera_screw_x,0.5*camera_screw_y,0]) cylinder(wall+1.0,camera_screw_r,camera_screw_r); + } + } + } +} + +module lid() { + difference() { + union() { + lid_shell(); + translate([0,0,0]) corner_support(); + translate([hole2hole_l,0,0]) corner_support(); + translate([hole2hole_l,hole2hole_w,0]) corner_support(); + translate([0,hole2hole_w,0]) corner_support(); + } + if(hdmi_recess==1) { + translate([tol+hdmi_offset-0.5*hdmi_recess_w,base_width+tol+0.1,lid_height+wall-hdmi_recess_h]) + cube([hdmi_recess_w, 2*wall,hdmi_recess_h+1]); + } + if(gpio==2) { + translate([tol + gpio_centre_x - gpio_length*0.5,-wall,lid_height+wall-gpio_recess_h]) + cube([gpio_length,4*wall,gpio_recess_h+1]); + } + } +} + +if (build == 1 || build == 3) { + base(); +} +if (build == 3) { + translate([0,base_width+4*wall,0]) lid(); +} +if(build == 2){ + lid(); +} \ No newline at end of file